Exibe a hora e data por extenso no campo id dt_inscricao

dias.js

function mostrarDataHora(){
  var hoje = new Date();
  
  //https://stackoverflow.com/questions/24998624/day-name-from-date-in-js
  var days = ['Domingo', 'Segunda', 'Terça', 'Quarta', 'Quinta', 'Sexta', 'Sábado'];
  var mons = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
  var nome = days[hoje.getDay()];
  
  var data = nome + ', ' + ("0" + hoje.getDate()).slice(-2) + ' de ' + mons[hoje.getMonth()] + ' de ' + hoje.getFullYear();
  var hora = ("0" + hoje.getHours()).slice(-2) + ":" + ("0" + hoje.getMinutes()).slice(-2) + ":" + ("0" + hoje.getSeconds()).slice(-2);
  
  document.getElementById("dt_inscricao").value = hora + ' - ' + data;
}

window.onload = function(){
  mostrarDataHora();
};